Two-Wire True Zero Speed Miniature Differential

Peak-Detecting Gear Tooth Sensor with Continuous Calibration

ATS642LSH

4

Allegro MicroSystems, LLC

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

OPERATING CHARACTERISTICS

Characteristic

Symbol

Test Conditions

Min.

Max.

Units

SWITCHPOINT CHARACTERISTICS

S

d

e

e

p

S

n

o

it

a

t

o

R

ROT

m

p

r

0

0

0

,

8

–

0

0

-

0

6

t

e

g

r

a

T

e

c

n

e

r

e

f

e

R

z

H

k

–

0

4

0

2

B

d

3

–

f

o

t

t

n

e

l

a

v

i

u

q

E

W

B

h

t

d

i

w

d

n

a

B

l

a

n

g

i

S

g

o

l

a

n

A

B

t

n

i

o

P

e

t

a

r

e

p

O

OP

–

120

–

mV

B

t

n

i

o

P

e

s

a

e

l

e

R

RP

–

120

–

mV

CALIBRATION

C

n

o

it

a

r

b

il

a

C

l

a

it

i

n

I

I

Quantity of rising output (current) edges required for

accurate edge detection

––3

Edge

DAC CHARACTERISTICS

Allowable User-Induced Differential

Offset

Output switching only; may not meet datasheet speci-

cations

–±60

–

G

AG

∆

m

m

5

7

.

2

–

5

.

0

n

o

it

a

c

if

i

c

e

p

s

n

i

h

ti

w

C

D

Maximum Operational Air Gap

Range

Output switching (no missed edges); ∆DC not guaran-

teed

––3

mm

Duty Cycle Variation

∆DC

Wobble < 0.5 mm; Typical value at AG = 1.5 mm, for

max., min., AG within specification

41–61

%

%

–

5

.

1

±

–

m

m

5

.

1

=

G

A

G

0

0

0

1

–

0

3

n

o

it

a

c

if

i

c

e

p

s

n

i

h

ti

w

g

n

it

a

r

e

p

O

g

i

S

Minimum Operating Signal

Output switching (no missed edges); ∆DC not guaran-

teed

20

–

–

G

Note: di/dt is dependent upon the value of the bypass capacitor, if one is used.

acterized. The field available from the reference target is given in the reference target parameter section of the datasheet.

effect of target wobble.